P3021 - Battery Block 11 Becomes Weak

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty HV battery assembly
  • Faulty Battery ECU

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P3021 Description

If there is an abnormal internal resistance or electromotive voltage in the hybrid battery blocks, the hybrid battery Electronic Control Unit (ECU) determines that a malfunction has occurred. When the malfunction detection condition is satisfied, the battery ECU illuminates the MIL and sets a Diagnostic Trouble Code (DTC).
OBDII Code P3021 - Battery Block 11 Becomes Weak - AutoCodes.com

P3021 Information for specific makes

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P3021 Comments

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